US3796777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow spheres by spray drying
Assignee: PQ Corp
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Filing: 1972-02-03
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Granted: 1974-03-12
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Expires: 1992-02-03
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF AN ECONOMICAL FILLER OF LOW BULK DENSITY THAT IS ESPECIALLY USEFUL FOR INCORPORATION IN UNSATURATED POLYESTER SYSTEMS AND WHICH DOES NOT REACT WITH THE COMPONENTS OF THE UNSATURATED POLYESTER SYSTE,. SOLUTIONS OF SODIUM SILICATE AND AMMONIUM PENTABORATE ARE MIXED, SPRAY DRIED, AND THE PRODUCT FROM THE SPRAY DRIER IS THEN FURTHER DRIED TO A WATER CONTENT BELOW ABOUT 7%.
Inventors
- 👤 D Netting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/04; C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/26
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |